For durability, Noble also added forged pistons, an oil cooler, a larger baffled oil sump, and extra cooling ducts. Its engine has a maximum power of 425 bhp (317 kW) at 6,500 rpm, with a torque figure of 390 lb·ft (530 N·m) at 5,000 rpm.[6] This power and a light weight allow the M400 to achieve a power-to-weight ratio of just over 400 bhp/ton, the figure for which it was named, a 0–60 mph (97 km/h) of 3.2 seconds and a 1/4-mile time of 11.4 @ 119.8 mph (192.8 km/h).[7][3] Top speed is 187 mph (301 km/h). The UK automotive TV show Vroom Vroom suggested that the M400 gave Ferrari Enzo performance at a Porsche 911 price.

Noble no longer manufactures the M400. The exclusive dealer for Noble in the US, 1G Racing in Ohio, USA (also known as Rossion), has obtained the production rights to the M400 from Noble Automotive, and has released an updated version named Rossion Q1. 1G's version of the M400 includes a redesigned aerodynamic shell, a new interior and an upgraded engine management system (uprating it to 450 bhp).[8] 0-60 mph (0–100 km/h) has dropped from 3.3 seconds to 3.1.[9] Its top speed changed to 189 mph (304 km/h).